Temperature Output Calibration; Temperature Reset (Tmp Rset); Temperature Master Calibration - K-TEK AccuTrak AT100 Installation & Operation Manual

4.0 TRANSMITTER CALIBRATION AND SETUP

4.9.2 Temperature Output Calibration

The transmitter is factory calibrated to an accuracy of ±0.5° Celsius, over a range of -200 to 300°C. Fine
calibration and trim for a custom range can be done via the following steps:

Setting the Lower Temperature Trim (LTT)
-Bring the sensor (located near the bottom of the transmitter probe) to the temperature that will be the lower
end of the temperature range.
-Under the CAL menu, go to the LTT (Lower Temperature Trim) menu option. Press SELECT to change
LTT to the current temperature of the sensor.

Setting the Upper Temperature Trim (UTT)
-Bring the sensor (located near the bottom of the transmitter probe) to the temperature that will be the upper
end of the temperature range.
-Under the CAL menu, go to the UTT (Upper Temperature Trim) menu option. Press SELECT to change
UTT to the current temperature of the sensor.
Note: Trim must be within 10°C of factory calibration to be accepted.

4.9.3 Temperature Reset (TMP RSET)

If required, the unit‟s temperature settings (i.e. LTT and UTT) can be reset to the factory temperature
calibration. To reset the unit to the factory temperature calibration, navigate to the TMP RSET menu option and
press SELECT.

4.9.4 Temperature Master Calibration

The temperature indication of the AT100 will be factory calibrated from –200 to 300 degrees C. Under
normal circumstances, it will not be necessary to recalibrate the temperature transmitter.
recalibration is required, the following steps will be used.
1. Disconnect the power.
2. Setup decade box per drawing in Section 8 - Wiring Diagrams
3. Set resistance to 185 ohms.
4. Apply power.
5. Set EUN TEMP to °C (Celsius)
6. Cycle through CFG menu to END.
7. At END push UP and DOWN together.
8. At FAC –200 press SELECT then UP and DOWN at the same time.
9. Scroll Down to END and SELECT.
10. Verify TMP indicates -200°C.
11. Disconnect the power.
12. Set decade box for 2120 ohms.
13. Apply power.
14. Cycle through CFG menu to END.
15. At END push UP and DOWN together.
16. Scroll down to FAC 300.
17. Press SELECT then UP and DOWN at the same time.
18. Scroll Down to END and SELECT.
19. Verify TMP indicates 300°C.
20. Disconnect the power.
21. Reconnect RTD.
22. Reapply power.
AT100-0200-1 Rev L (10-2010) DCN0528
If for some reason
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